Police say Tywann Jones, 35, of Roxbury, was waiting outside the 7-Eleven at 750 Massachusetts Ave. around 1:40 a.m. Saturday morning when one man jumped out of a car and stabbed Jones.

Jones was transported to Massachusetts General Hospital with life-threatening injuries and died around 4:40 a.m.

Middlesex County District Attorney Marian Ryan believes someone may know something. "That's an area with lots of establishments that were open or just winding down, so we believe there are people who have seen things."

No one has been arrested in connection with the stabbing, but police believe there is a connection between Jones and his killer.

The investigation is ongoing and anyone with information should contact the Cambridge Police Department at 617-349-3300.